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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4c4501a4a8f46f91eca31ddc88258de844d5df7060f6b71fab2383701f4f98' 
  AND token = '8kX+jstUiozucRR0W4MmEXf/Q+FdliTW/+vUzM/vI/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}